【摘要】：在公路互通和城市立交中,為使結(jié)構(gòu)線形順暢,通常需設(shè)置變寬度異型橋梁作為主橋連接匝道的過渡橋梁。由于該類型橋構(gòu)造較為特殊,在力學(xué)行為方面比一般箱梁橋顯得更為復(fù)雜,表現(xiàn)出明顯的空間受力特性,這種結(jié)構(gòu)與受力上的復(fù)雜性給設(shè)計增添了一定的難度。目前而言,對變寬異型橋的研究主要集中在計算方法和模型試驗上,很少對異型橋的受力特性進行專門的分析研究,因此針對此類橋梁結(jié)構(gòu)在力學(xué)特性方面展開研究,具有很好的理論價值和工程實際意義。本文以某互通式立交橋左幅第五聯(lián)主線橋為工程背景,研究的主要內(nèi)容及得出的結(jié)論如下:1.系統(tǒng)論述梁格法分析箱梁結(jié)構(gòu)的基本原理,歸納總結(jié)不同箱室結(jié)構(gòu)的梁格劃分方式和方法;通過實際建模分析,就梁格法進行有限元建模的相關(guān)問題進行了探討,總結(jié)出梁格法分析變寬異型橋的建模要點。2.以板單元模型作為參照,在代表性工況下與梁格模型就支座反力、主梁撓度變形以及應(yīng)力方面進行對比分析,模型計算結(jié)果表明:采用梁格法在計算變寬異型橋力學(xué)特性方面可以滿足精度要求。3.為探究支座布置形式對變寬異型橋受力的影響,分析比較三種支座布置方案在主梁內(nèi)力以及支座反力方面的差異,得出支座布置對結(jié)構(gòu)受力的影響變化規(guī)律,給出了異型橋支座布置建議。4.以實際工程探究支點橫梁剛度以及跨中橫隔板設(shè)置對變寬異型橋受力特性的影響,結(jié)合結(jié)構(gòu)力學(xué)行為規(guī)律給出變寬異型橋的橫隔板布置建議,為同類型橋的設(shè)計提供一定的參考。5.依據(jù)對變寬異型連續(xù)箱梁橋受力特性以及梁格法理論的研究成果,開展結(jié)構(gòu)荷載試驗研究,與實際測量數(shù)據(jù)進行對比分析,驗證該橋模型在梁格劃分以及剛度計算的合理性,同時為該類型橋的荷載試驗提供參考。
[Abstract]:In order to make the structure linear smooth, it is usually necessary to set up the special-shaped bridge with variable width as the transitional bridge of the main bridge connecting ramp in the process of highway interworking and urban interchange. Because of the special structure of this type of bridge, the mechanical behavior of this type of bridge is more complex than that of the general box girder bridge, and it shows obvious spatial stress characteristics. The complexity of this structure and force adds a certain degree of difficulty to the design. At present, the research on variable width special-shaped bridge mainly focuses on the calculation method and model test, and few special analysis and research on the mechanical characteristics of special-shaped bridge are carried out, so the mechanical properties of this kind of bridge structure are studied. It has good theoretical value and engineering practical significance. In this paper, based on the engineering background of the fifth main line bridge on the left side of an interchangeable overpass, the main contents and conclusions of the study are as follows: 1. This paper systematically discusses the basic principle of analyzing box girder structure by beam grid method, and sums up the methods and methods of beam lattice division of different box room structures. Through the actual modeling analysis, the related problems of finite element modeling by beam grid method are discussed, and the modeling points of variable width special-shaped bridge analyzed by beam grid method are summarized. 2. Taking the plate element model as a reference, the support reaction force, deflection deformation and stress of the main beam are compared and analyzed with the beam lattice model under representative working conditions. The results of model calculation show that the beam lattice method can meet the accuracy requirements in calculating the mechanical properties of special-shaped bridges with variable width. In order to explore the influence of bearing arrangement on the force of special-shaped bridge with variable width, the differences of internal force and reaction force of main beam in three kinds of bearing arrangement schemes are analyzed and compared, and the influence law of bearing arrangement on structural force is obtained. Some suggestions on the arrangement of special-shaped bridge supports are given. 4. This paper probes into the influence of the stiffness of the beam at the fulcrum and the setting of the transverse partition in the middle of the span on the mechanical characteristics of the special-shaped bridge with variable width, and puts forward some suggestions for the arrangement of the diaphragm of the special-shaped bridge with variable width according to the law of the mechanical behavior of the structure. It provides a certain reference for the design of the same type of bridge. 5. Based on the research results of the stress characteristics of variable width special-shaped continuous box girder bridge and the theory of beam lattice method, the structural load test research is carried out, and the actual measurement data are compared and analyzed to verify the rationality of the bridge model in beam lattice division and stiffness calculation. At the same time, it provides a reference for the load test of this type of bridge.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.213

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳偉;賀國京;劉敬坤;;鋼筋混凝土異形板橋梁受力性能研究[J];湖南交通科技;2016年01期

2 孫恒;胡營;;梁格法在變寬橋計算中的應(yīng)用[J];山西交通科技;2014年06期

3 邢繼勝;;采用梁格法對異形道岔梁支座布置的優(yōu)化設(shè)計[J];鐵道標(biāo)準(zhǔn)設(shè)計;2014年08期

4 程建旗;雷波;祝立君;;異形寬幅連續(xù)箱梁橋支座反力分析[J];公路;2014年04期

5 彭斌;彭新星;;異型曲線鋼箱梁橋支座布置方式研究[J];公路工程;2014年02期

6 陶能遷;葉巖下;;異型混凝土箱梁橋合理計算模式研究[J];重慶交通大學(xué)學(xué)報(自然科學(xué)版);2013年05期

7 武占科;;現(xiàn)澆混凝土異形板梁橋支座布置分析[J];上海公路;2013年03期

8 岳衛(wèi)東;;某立交橋岔口異形結(jié)構(gòu)空間力學(xué)特性分析[J];山東交通學(xué)院學(xué)報;2013年01期

9 郭才廣;;異形梁橋設(shè)計探討[J];交通科技;2013年01期

10 蔡佳駿;張玉;;城市異形鋼箱梁設(shè)計若干問題探討[J];交通科技;2012年03期

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